冬期에 있어서 炭酸까스型法의 問題點

姜樂遠,劉甲鍾 영남이공대학 1972 論文集 Vol.1 No.-

I measured the quality change process of water glass in every factor, and its consequence upon core. Result of the survey findings are as follows. 1. Binder casts less influence than temperature to quality change. 2. Plasticity of water glass is to be maintained above 20℃ 3. More Na_2O results in increased sintering and adverse effect for re-collecting of sand. 4. Relativity between temperature and concentration effects plasticity. The above prescrived findings should be duly respected and carefuly carried out to improve works.

합금백주철에 있어서 미세조직이 마찰마모성에 미치는 영향

姜樂遠 영남이공대학 1999 論文集 Vol.28 No.-

Three different white cast irons alloyed with Cr, V, Mo and W were prepared in order to study their abrasion wear behavior. The specimens were produced using a 15㎏-capacity Mica lined high frequency induction furnace. Melts were super-heated to 1600℃, and poured at 1550℃ into Y-block pepset molds. Throe combinations of the alloying elements were slected so as to obtain the different types of carbide st겨ctures in the matrix: 3%C-10%Cr-5%Mo-5%W. 3%C-10%V-5%Mo-5%W and 3%C-17%Cr-3%V. A scratching type abrasion test was carried out in the states of as-cast(AS), homugenizing(A.fi), air-hardening(AHC) and tempering(AFQT). First of all, the as-cast specimens were homogenized at 950T for 5h under the vacuum atmosphere. Then they were air-hardened at 1050℃ for 2h and followed by tempering at 300℃ for 3h. Abrasion wear test was conducted using the abrasive paper with l20 mesh SiC and 1kg applied load. The wear loss of the test piece(50㎜ × 50㎜ × 5㎜) was measured after one cycle of wear test and this procedure was repeated up to 8 cycles. In all the specimens, the abrasion wear loss was found to decrease in the order of AH, AS, AHFT and AHF states. Abrasion wear loss was lowest in the specimen No. 2 and highest in the specimen No. 1 except for the as cast and homogenized condition in which the specimen No. 3 showed the highest abrasion wear loss. The lowest abrasion wear loss of the specimen No. 2 could be attributed to the fact that it contained primary and eutectic MC carbides and eutectic MC carbide with extremely high hardness. The matrix of each specimen was fully pearlitic in the as-cast state while that in the heat-treated conditions consisted of pearlite, austenite and/or martensite. From these results, it becomes clear that MC carbide is a significant phase to improve the abrasion wear resistance.

Zn-22Al合金의 引張特性에 關한 考察

姜樂遠,李億燮 영남이공대학 1974 論文集 Vol.3 No.-

For the Zn-22Al alloy which are known as a super plastic material, tensile tests were carried out, and the results as followings were obtained empirically. (1) The work hardening exponents are not influenced by the rolling direction and approach less than n=±1. (2) The change of hardness doesn't occur front and rear the tensile test. (3) The workhardening exponents are changed according to the tensile velocity and approach about n=0 when the volocity becomes low velocity. (4) The maximum elongation extends to the 180%.

Furan 造型砂의 再生處理

姜樂遠 영남이공대학 1995 論文集 Vol.24 No.-

Recently, the clean foundry is ugently required due to the more strict law against enviromental poliution and waste materials. Because of easy reclamation, the Furan Molding process is demanded more and it is necessary to clarify the property of Furan resin and burned sand. In this experiment, the relation of the initial strength and the sand temperature depending on released time after pouring was tested, based on an invariation ratio of quantity of resin and catalyst. In this system, the initial strength was tested depending on the temperature of the input rebounded sand and the atmosphere controlled by the external heat soure and variation of the released time after pouring.

Top Charge Cupola와 Annealing Furnace(Individual Charge)를 利用한 Malleable Cast Iron에 대한 硏究

姜樂遠 영남이공대학 1975 論文集 Vol.4 No.-

In producing black malleable cast iron, it is well known that the melting methods and mechanical properties of these are the most important. In this paper, above important items were experimented and investigated. So, following items were gained as results. 1) The influence of materials on the operation must be removed by making a thorough going supervision to the charging materials during the melting period. 2) The increased tensile strength was about 3 -5kg/mm' according to reducing 0.5% carbon and 0.9% silicon. 3) It was necessary that the mixture ratio of steel scrap should be increased and the indirect reduction should be promoted in the high temperature melting method. 4) According to the incerasing the mixture ratio of steel scrap, the cold air type should be reconstructed to the hot air type. Above mentioned items are well kept, RMC 35 can be gained even if individual charging type are used.

알루미늄 擴散被服한 鋼의 耐酸化性

姜樂遠,李億燮,金奎鎬 영남이공대학 1977 論文集 Vol.6 No.-

Samples prepared for the oxidation tests were diffusion-coated at 750℃, 850℃ and 950℃ for 3hrs. The oxidation tests were conducted in the stationary atmosphere at 800℃, 900℃ and 1000℃. The oxidation beheavior was discussed by measurements of weight increase of Al concentration in the samples. The results of experiments were as follows; (I) It was proved that AI diffusion coated steel was effective as much as stainless steel in oxidation resistance. (2) Oxidation weight increase was proportional to AI interface concentration of the samples. (3) Repeating oxidation of the samples was inferior to contineous oxidation. in oxidation resistance. (4) Although the amount of Al diffusion coating increase. it is not proportional to the increase of the oxidation resisting time because the amount of At diffusion coating has secondary diffusion in the samples.

經年自然砂의 海砂와 水分含量度變化에 따른 乾濕態性質에 大한 硏究

姜樂遠 영남이공대학 1972 論文集 Vol.1 No.-

The purpose of experiment taken in this paper arc 1) to examine the basic properties of Moulding Sand included by quantities of Sea Sand, 2) to examine the various properties of Moulding Sand included by Sea Sand, 3) and to improperties of Moulding Sand. The experiments are following. 1. Influence of water upon Moulding. 2. Influence of quantities Sea Sand as additive upon Moulding Sand. 3. Various properties Green Sand Moulding and Dry Sand Moulding. 4. Relationship of temperature and linear expansion. The last result in small and medium size casting (in using Moulding Sand of Young Nam Instititute of technology) can be obtained by adding 8-11%. of moisture to 13-15% Sea Sand by mixing a little bit of cushion (1-2%)

주기적 열처리 및 냉각속도가 오스테나이트 결정입도에 미치는 영향

강락원,예길촌,이종무 영남이공대학 1976 論文集 Vol.5 No.-

In the present study the authors investigated the effects of the alloy additions like aluminium and carbon, the annealing temperature and the cooling rate after the stluitomtreatment on the austenitic grain size in the aluminum-killed steel, especially how the austenitic grain size is affected by the cyclic heat treatment. The main results obtained are as follows; 1) It is considered that the other alloying elements, carbon and manganese etc., in addition to the aluminium nitride contribute to the austenitic grain refinement. 2) The specimens quenched in the water after the solution treatment represented lower grain coarsening temperature than that cooled in the furnace. 3) The effects of the cyclic heat treatment on the austenitic grain size is negligible.

加味蘇子降氣湯이 알레르기 喘息의 呼吸樣相 및 氣管組織의 好酸球浸潤에 미치는 影響

강락원,박동일 동의대학교 한의학연구소 2000 동의한의연구 Vol.4 No.-

목적 : 본 연구는 가미소자강기탕이 알레르기 천식의 호흡양상 및 기관조직의 호산구 침윤에 미치는 긍정적 영향에 대한 검증을 하기 위한 실험이다. 방법 : EW 이식에 의한 감작 이후 대조군과 약을 투여군에 약물을 투여한 후 OVA 흡입을 통하여 천식을 유발시키고 호흡 양상 변화의 측정과 현미경을 통한 기관조직의 병적 변화 및 호산구 침윤의 양상을 관찰 후 통계 처리하였다. 결과 : 대조군은 일시적인 호흡 정지 또는 호기의 연장, 호흡수 감소, 호흡 길이 단축, 호기성 호흡곤란의 이상호흡 빈도가 증가하였고 기관조직내에서 호산구 침윤, 상피층의 부종 또는 박리가 나타난 반면 약물 투여군은 이상호흡의 빈도가 대조군에 비해 현저히 감소하고 호산구의 침윤이 뚜렷이 감소하였다. 이러한 실험결과는 가미소자강기탕이 알레르기 천식에 있어 그 호흡양상의 개선과 기관조직 내의 부종, 호산구 침윤의 감소에 있어 유의성이 있음을 나타낸다. 결론 : 이러한 결과로 볼 때 가미소자강기탕은 알레르기 천식에 있어 그 호흡양상의 개선과 기관조직 내의 부종, 호산구 침윤의 감소에 있어 긍정적 치료 효과를 기대할 수 있으며, 임상상에서의 활용에 더욱 적정한 가능성을 가진다고 하겠다. This study was aimed to evaluate the effects of Gami-Sojagangki-Tang on the respiratory parterns and tracheal tissues in allergic asthma. In this experiment, white rats were divided into 3 groups ; Normal group, Control group and Gami-Sojagangki-Tang group. The results were as follows : 1. There was no significant difference in individual respiratory pattem between sample group which was treated with Gami-Sojagangki-Tang and control group. 2. Gami-Sojagangki-Tang decreased the number of malformed respiration with respect to control group (P<0.05). 3. Gami-Sojagangki-Tang decreased the number of eosinophils infiltrated in tracheal mucosa with respect to control group (P<0.05). Depending upon above results, it is considered that Gami-Sojagangki-Tang has the inhibitory effects on the process of allergic asthma and suggested that it could be used in relieving patients of the symptoms caused by allergic asthma.

APT와 Co이온의 置換反應을 이응한 結合材 添加方法에 관한 硏究

강락원,김병재 영남이공대학 1991 論文集 Vol.20 No.-

Detailed examination has been carried out for researching the new methode of binder in tungsten-based alloy by chemical reaction between APT and nitrate solution of Co. The results obtained are as follow : Chemical reaction between APT and nitrate solution of Co was convinced substitution reaction between NH_(4)^(-), ions in APT and Co^(--) ions in nitrate solution of Co. Complex compounds produced by substitution reaction were very fine particles, and its contents of Co were increased from 1.89% to 4.72% by elevating the mole fraction of nitrate solution of Co.